Four rules
They are on the proposal as well as here.
Fixed, not estimated
The price on the proposal is the price on the invoice unless you change the scope in writing.
No tiered options
One recommendation, priced. Three tiers exist to make the middle one look reasonable and we would rather just tell you what to do.
Pass-through at cost
Media spend, print, freelancers and licences at exactly what they cost us, with the invoices attached.
Half up front, half on delivery
No monthly drip, no payment schedule designed to make stopping painful.